Ocean floating type drilling platform crown-block heave compensator

Abstract

The invention relates to an ocean floating type drilling platform crown-block heave compensator which comprises an upper bracket and a lower bracket, wherein the upper bracket and the lower bracket are fixedly connected to the upper part and the lower part of an crown block frame respectively; the top of the upper bracket is fixedly connected with a connecting frame; two pairs of guide rails are vertically arranged between the connecting frame and the crown block frame in parallel; a floating pulley assembly which can move up and down along the guide rails is arranged on the guide rails; the lower end of the floating pulley assembly is connected with a hydraulic cylinder assembly; the hydraulic cylinder assembly is connected with a power and control system; a fast line rocking arm assembly, a fast line guide device, a dead line rocking arm device and a dead line guide device are respectively arranged on the crown block frame; the fast line guide device and the dead line guide device are respectively connected with the floating pulley assembly; and the fast line rocking arm assembly, the fast line guide device, the floating pulley assembly, a loose pulley, the dead line guide device and the dead line rocking arm device are connected by steel ropes. The heave compensator has the advantages of large compensation load, compact structure, low energy consumption and good compensation effect and can meet the performance requirement of ocean drilling well operation and realize automated control operation.

Description

Technical field [0001] The present invention belongs to the field of oil drilling equipment technology, involving a compensation device for the rise of the marine floating platform, which is specific to a marine floating drilling platform. Background technique [0002] Under the influence of waves, the floating drilling platform not only produces a swing movement, but also generates a periodic up and down movement with the waves.The periodic up and down rising movement of the floating drilling platform causes the entire drilling system to generate cyclical upper and lower movements, which is not conducive to drilling, which reduces the drill pressure. When the drill pressure decreases to a certain limit, the drill bit leaves the bottom of the well.Unable to continue drilling.Therefore, in order to ensure that the floating drilling platform can drill normally and reduce the stoppage time, the compensation device must be increased to solve the decrease in drilling pressure caused b...

AI Technical Summary

Problems solved by technology

Among them, the compensation effect of the dead rope / fast rope compensation device is relatively poor, and the steel wire rope wears seriously, so there are not many practical applications; the traveling block compensation device is installed and used between the traveling block and the hook, but the device is installed on the deck as a whole, occupying The deck area is larger, and the seal leakage of the oil cylinder is larger

The compressor, oil pump, regulating control valve group and not too long pipeline in the existing crown block compensation device are arranged on the hull deck, and its main mechanisms are all installed on the crown block platform and derrick. It is required to install the crown block compensation device The crown block and derrick must have high strength, but the high strength requirement makes the structure of the crown block and derrick complex, and there are problems of excessive weight and wind load

At the same time, the heave compensation device installed on the crane platform is not convenient for maintenance

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